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Motorola DynaTAC
The DynaTAC is a series of cellular telephones manufactured by Motorola from 1983 to 1994. Unveiled on March 6, 1983, the DynaTAC was the first commercially available handheld cellular phone. A full charge took roughly 10 hours, and it offered 30 minutes of talk time. It also offered a LED display for dialing or recall of one of 30 phone numbers. It was priced at US$3,995 in 1984, its commercial release year, equivalent to $ in . Several models followed, starting in 1985 with the 8000s and continuing with periodic updates of increasing frequency until 1993's Classic II. The DynaTAC was replaced in most roles by the much smaller MicroTAC when it was first introduced in 1989, and by the time of the StarTAC's release in 1996, it was obsolete. Name DynaTAC was an abbreviation of "Dynamic Adaptive Total Area Coverage". The TAC abbreviation would later also be used on the MicroTAC, StarTAC and TeleTAC lines of products. History The first cellular phone was the culmination of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Motorola
Motorola, Inc. () was an American multinational telecommunications company based in Schaumburg, Illinois. It was founded by brothers Paul and Joseph Galvin in 1928 and had been named Motorola since 1947. Many of Motorola's products had been radio-related communication equipment such as two-way radios, consumer walkie-talkies, cellular infrastructure, mobile phones, satellite communicators, pagers, as well as cable modems and semiconductors. After having lost $4.3 billion from 2007 to 2009, Motorola was split into two independent public companies: Motorola Solutions (its legal successor) and Motorola Mobility (spun off), on January 4, 2011. Motorola designed and sold wireless network equipment such as cellular transmission base stations and signal amplifiers. Its business and government customers consisted mainly of wireless voice and broadband systems (used to build private networks), and public safety communications systems like Astro and Dimetra. Motorola's h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Patent
A patent is a type of intellectual property that gives its owner the legal right to exclude others from making, using, or selling an invention for a limited period of time in exchange for publishing an sufficiency of disclosure, enabling disclosure of the invention."A patent is not the grant of a right to make or use or sell. It does not, directly or indirectly, imply any such right. It grants only the right to exclude others. The supposition that a right to make is created by the patent grant is obviously inconsistent with the established distinctions between generic and specific patents, and with the well-known fact that a very considerable portion of the patents granted are in a field covered by a former relatively generic or basic patent, are tributary to such earlier patent, and cannot be practiced unless by license thereunder." – ''Herman v. Youngstown Car Mfg. Co.'', 191 F. 579, 584–85, 112 CCA 185 (6th Cir. 1911) In most countries, patent rights fall under private la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trickle Charging
Trickle charging is the process of Battery charger, charging a fully charged battery (electricity), battery at a rate equal to its self-discharge rate, enabling the battery to remain at its fully charged level. This state occurs almost exclusively when the battery is not loaded, as trickle charging will not keep a battery charged if current is being drawn by a load. A battery under continuous float voltage charging is said to be float-charging. For lead–acid batteries under no-load float charging (such as in SLI battery, SLI batteries), trickle charging happens naturally at the end-of-charge, when the lead–acid battery internal resistance to the charging current increases enough to reduce additional charging current to a trickle, hence the name. In such cases, the trickle charging equals the energy expended by the lead–acid battery splitting the water in the electrolyte into hydrogen and oxygen gases. Other battery chemistries, such as lithium-ion battery technology, cannot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Federation Of Information Processing Societies
The American Federation of Information Processing Societies (AFIPS) was an umbrella organization of professional societies established on May 10, 1961, and dissolved in 1990. Its mission was to advance knowledge in the field of information science, and to represent its member societies in international forums. History AFIPS grew out of the National Joint Computer Committee (NJCC), an organization formed in 1951, which held two major computer conferences: the Eastern (EJCC) and Western Joint Computer Conferences (WJCC). The three founding societies of AFIPS were the Association for Computing Machinery (ACM), the American Institute of Electrical Engineers (AIEE), and the Institute of Radio Engineers (IRE). AFIPS represented these societies in the International Federation for Information Processing (IFIP), formed a year earlier under the auspices of UNESCO. In 1962, AFIPS took over sponsorship of the EJCC and WJCC and renamed them the Spring (SJCC) and Fall Joint Computer Con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Modem
The Democratic Movement (, ; MoDem ) is a centre to centre-right political party in France, whose main ideological trends are liberalism and Christian democracy, and that is characterised by a strong pro-Europeanist stance. MoDem was established by François Bayrou to succeed the Union for French Democracy (UDF) and contest the 2007 legislative election, after his strong showing in the 2007 presidential election. Initially named the Democratic Party (''Parti démocrate''), the party was renamed "Democratic Movement", because there was already a small Democratic Party in France. MoDem secured an agreement with La République En Marche! (LRM) — later Renaissance (RE) — in the 2017 legislative election after Bayrou had endorsed the candidacy of Emmanuel Macron in February. The two parties have since been in alliance, as of late named Ensemble. The party's founder and leader Bayrou has served as Prime Minister of France since December 2024. History Background MoDem tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transceiver
In radio communication, a transceiver is an electronic device which is a combination of a radio ''trans''mitter and a re''ceiver'', hence the name. It can both transmit and receive radio waves using an antenna, for communication purposes. These two related functions are often combined in a single device to reduce manufacturing costs. The term is also used for other devices which can both transmit and receive through a communications channel, such as ''optical transceivers'' which transmit and receive light in optical fiber systems, and ''bus transceivers'' which transmit and receive digital data in computer data buses. Radio transceivers are widely used in wireless devices. One large use is in two-way radios, which are audio transceivers used for bidirectional person-to-person voice communication. Examples are cell phones, which transmit and receive the two sides of a phone conversation using radio waves to a cell tower, cordless phones in which both the phone hands ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metal–oxide–semiconductor
upright=1.3, Two power MOSFETs in amperes">A in the ''on'' state, dissipating up to about 100 watt">W and controlling a load of over 2000 W. A matchstick is pictured for scale. In electronics, the metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, MOS FET, or MOS transistor) is a type of field-effect transistor (FET), most commonly fabricated by the controlled oxidation of silicon. It has an insulated gate, the voltage of which determines the conductivity of the device. This ability to change conductivity with the amount of applied voltage can be used for amplifying or switching electronic signals. The term ''metal–insulator–semiconductor field-effect transistor'' (''MISFET'') is almost synonymous with ''MOSFET''. Another near-synonym is ''insulated-gate field-effect transistor'' (''IGFET''). The main advantage of a MOSFET is that it requires almost no input current to control the load current under steady-state or low-frequency conditions, e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ALOHAnet
ALOHAnet, also known as the ALOHA System, or simply ALOHA, was a pioneering computer networking system developed at the University of Hawaii. ALOHAnet became operational in June 1971, providing the first public demonstration of a wireless packet data network. The ALOHAnet used a new method of medium access, called ''ALOHA random access'', and experimental ultra high frequency (UHF) for its operation. In its simplest form, later known as Pure ALOHA, remote units communicated with a base station (Menehune) over two separate radio frequencies (for inbound and outbound respectively). Nodes did not wait for the channel to be clear before sending, but instead waited for acknowledgement of successful receipt of a message, and re-sent it if this was not received. Nodes would also stop and re-transmit data if they detected any other messages while transmitting. While simple to implement, this results in an efficiency of only 18.4%. A later advancement, Slotted ALOHA, improved the effi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Whip Antenna
A whip antenna is an antenna consisting of a straight flexible wire or rod. The bottom end of the whip is connected to the radio receiver or transmitter. A whip antenna is a form of monopole antenna. The antenna is designed to be flexible so that it does not break easily, and the name is derived from the whip-like motion that it exhibits when disturbed. Whip antennas for portable radios are often made of a series of interlocking telescoping metal tubes, so they can be retracted when not in use. Longer whips, made for mounting on vehicles and structures, are made of a flexible fiberglass rod around a wire core and can be up to long. The length of a whip antenna is determined by the wavelength of the radio waves it is used with. Their length varies from compact electrically short antennas wavelength long, up to wavelength to improve directivity. The most common type is the ''quarter-wave whip'', which is approximately long. Whips are the most common type o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Richard H
Richard is a male given name. It originates, via Old French, from Old Frankish and is a compound of the words descending from Proto-Germanic language">Proto-Germanic ''*rīk-'' 'ruler, leader, king' and ''*hardu-'' 'strong, brave, hardy', and it therefore means 'strong in rule'. Nicknames include " Richie", " Dick", " Dickon", " Dickie", " Rich", " Rick", "Rico (name), Rico", " Ricky", and more. Richard is a common English (the name was introduced into England by the Normans), German and French male name. It's also used in many more languages, particularly Germanic, such as Norwegian, Danish, Swedish, Icelandic, and Dutch, as well as other languages including Irish, Scottish, Welsh and Finnish. Richard is cognate with variants of the name in other European languages, such as the Swedish "Rickard", the Portuguese and Spanish "Ricardo" and the Italian "Riccardo" (see comprehensive variant list below). People named Richard Multiple people with the same name * Richard Ander ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soldier Field
Soldier Field is a multi-purpose stadium on the Near South Side, Chicago, Near South Side of Chicago, Illinois, United States. Opened in 1924 and reconstructed in 2003, the stadium has served as the home of the Chicago Bears from the National Football League (NFL) since 1971, as well as Chicago Fire FC of Major League Soccer (MLS) from 1998 to 2006 and since 2020. It also regularly hosts stadium concerts and other large crowd events. The stadium has a football capacity of 62,500, making it the List of current National Football League stadiums, smallest stadium in the NFL. Soldier Field is also the oldest stadium established in the NFL and 3rd oldest in MLS. The stadium's interior was rebuilt as part of a major renovation project in 2002, which modernized the facility but lowered its seating capacity, eventually causing it to be delisted as a National Historic Landmark in 2006. Soldier Field has served as the home venue for a number of other sports teams in its history, includin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chicago Tribune
The ''Chicago Tribune'' is an American daily newspaper based in Chicago, Illinois, United States. Founded in 1847, it was formerly self-styled as the "World's Greatest Newspaper", a slogan from which its once integrated WGN (AM), WGN radio and WGN-TV, WGN television received their call letters. It is the most-read daily newspaper in the Chicago metropolitan area and the Great Lakes region, and the List of newspapers in the United States, sixth-largest newspaper by print circulation in the United States. In the 1850s, under Joseph Medill, the ''Chicago Tribune'' became closely associated with the Illinois politician Abraham Lincoln, and the then new Republican Party (United States), Republican Party's progressive wing. In the 20th century, under Medill's grandson 'Colonel' Robert R. McCormick, its reputation was that of a crusading newspaper with an outlook that promoted Conservatism in the United States, American conservatism and opposed the New Deal. Its reporting and commenta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
